St. Landry democrat., 1887-07-16
SCIENTIFIC SCRAPS.
Subjects Interesting Specialists Throusn-
out the Entire World

A good disinfectant is made py ols-
solving half drachm of nitrate OF iead Ia
| pint Of boiling water: then dissolve wv
! drachms of common salt in eight or ten qual 70
of water. When both are Thoroughly ois
| solved. pour the two mixtures together, ana
when the sediment has settled you nave pau
| of clear fluid, which Is the saturated solu1lon
of the chloride OF lead. A cloth saturated Will
| the liquid and hung up in a room Will sf1 once
sweeten a fetid atmosphere. Poured oo"n
sink, water closet, or drain, or any oecayihs oi
offensive object, it will produce the same ro-
suit. The nitrate of lead is very cheap anu
pound of it would make several barrels OF Ine
disinfectant.
Professor Scribner, of the Department
Of Agriculture, Washington, in paper on
fungi says that while suphate of copper anu
Gme applied separately, have very uttle Il
any effect in preventing mildeW IN V1nes' 'ne
combination of the two has entlrely pre-
vented it. A good formula was to dissolve one
pound sulphate of copper in two gallons OF
water. Slake two pounds of good lime IN tne
same quantity of water and then mix the solu-
tions, when the mixture should be Thoroughly
applied to vine and foliage.
Screws that are too small for separate
treatment may be cleaned from rust as fol-
lows: Take pound of screws and place them
in small box-a cigar box will do; put a snali
quantity of Oil on them and shake Tor NIL
ute; then put a piece Of cotton waste ID tne
box, and repeat for a minute; hnally put
handful of sawdust in the box, and shake LOT
another minute or So and remove the sawdust
by sitting it from the screws in tine Sieve
The screws will come out well cleaned.
William G. Kingsley, protector OF the
Brooklyn bridge, estimated many years ago,
in the infancy of the enterprise, that 36OOO,oU
persons per annum would represent It's maxi
mum capacity. and that this number OF peo-
pie would be using the bridge in l9OO ALREADY
2,,5OO,0OO people cross the bridge, and at the
present rate of increase Mr.. Kingsley's estl-
mate may be reached in 1890, ten years before
the time fixed by him.
The cleanest and most perfectly pol
ished floors have water used on them Iney
are simply rubbed off every morning with
large flannel cloth. which is soaked in kerosene
Oil once in two or three weeks. Take the clotn,
and with rubbing brush or stubby broom
go rapidly up and down the planks mot across
them. After few rubbings the floor will as
sumo polished appearance that is not easily
defaced.
At this season of the year the annoy
ance caused to animals by flies and mosquitoes
often amounts to positive agony. Horses and
milch cows may be protected in great meas
ure, by wiping them all over with a sponge
dipped in soap suds in which a little carbouc
acid has been Mixed Scientific american.
Steam and gas filters have just learned
that graphite properly prepared is superior to
red lead for making joints and connections.
1t is said that this article will not set under
any conditions. but that it makes perfect
joint and preserves the iron from rust.
1t is not necessary to bave different
metals to obtain a current of electricity. Iron
in nitric acid and iron in sulphuric acid, the
two fluids being separated bya porous parti-
ton, will give current. one plate wasting
away while the other is thickened
A trade journal states gelatine is the
latest adulterant of butter By adding gela-
tine, which absorbs ten times its weight of
water. the consistency of the butter is retained
and the water adulteration is not noticeable.
Oil stains may be removed from paper
by applying pipe clay powdered and mixed
with water to the thickness of cream; leave on
for four hours.